Yes, this is showing that your link from this interface is down.
Interface Admin Link Proto Local Remote reth4 up down
Admin = the interface configuration is active
Link = the physical layer link is down meaning the cable is not good or disconected or the partner interface is not up.
Since this is a reth interface you may also want to confirm the status of the underlying physical ethernet port. Look at the interface stanza and see which physical port is assigned to reth4 and also run the show interface terse for this physical interface to confirm it is admin up.
If no interface is assigned to reth4 then one will need to be assigned and connected to the desired partner device.